US4082680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gear oil compositions
Assignee: Phillips Petroleum Co
•
Filing: 1976-04-12
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Granted: 1978-04-04
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Expires: 1996-04-12
Abstract
Abstract Shear-stable, high viscosity index gear oil formulations are formed by the inclusion into such formulations of a small amount of a hydrogenated butadiene-styrene copolymer having a butadiene content of 30 to 44 weight percent and a weight average molecular weight in the range of about 12,000 to about 20,000.
Inventors
- 👤 Bill Mitacek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:53
CPC Classifications
C; C10; C10M; C10M143/00; C10M143/12; C10M2205/00; C10M2205/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
56 words
Shear-stable, gear oil compositions comprising a mineral lubricating oil containing a shear-stabilizing amount of a soluble hydrogenated butadiene-styrene copolymer dissolved therein, said copolymer having a butadiene content of about 30 to about 44 weight percent with the remainder being styrene and a weight average molecular weight within the range of from about 12,000 to about 20,000.
Claim 2
Dependent Claim
56 words
Shear-stable, gear oil compositions comprising a mineral lubricating oil containing a shear-stabilizing amount of a soluble hydrogenated butadiene-styrene copolymer dissolved therein, said copolymer having a butadiene content of about 30 to about 44 weight percent with the remainder being styrene and a weight average molecular weight within the range of from about 12,000 to about 20,000.
Claim 3
Dependent Claim
21 words
A composition according to claim 1 wherein the hydrogenated butadiene-styrene copolymer has an olefinic unsaturation of 5 weight percent or less.
Claim 4
Dependent Claim
24 words
A composition according to claim 1 wherein said copolymer has a weight average molecular weight in the range of about 13,000 to about 19,000.
Claim 5
Dependent Claim
31 words
A composition according to claim 1 wherein said copolymer is present in an amount in the range of about 3 to about 10 weight percent of the total gear oil composition.
Claim 6
Dependent Claim
19 words
A composition according to claim 1 wherein the copolymer has an olefinic unsaturation of less than 1 weight percent.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |